Chair



" Patented July 28, 1925 FSTATES' 'm-navan' Iiniv nooe mnnnnn endear. H.HAMII'ZTON, OF"GRAND'RAPIDS,MICHIGAN OFFICE.

I ns'sfreivonsfro AMERICAN'SEATINGCOMPA1\TY, or GRAND RAPIDS, MICHIGAN,A

Foonronnrdnor] new JER EY;

Masai .92. :ss a mo- 14302 Jo all w,hm.-it may .a0 ncfem' I 1 B i k w haWe, JQ 'Y -EN DEN BQOGAARD, ansubject of the Queen of the Netherlands,and JGEORGE ItIAMILTON, a

I citizen of {the ,United States, both residing drawings, in-whi'oh-zveFigure 1 is faytopplan =vieW of ,a: chair and .a desk fixed ininterrelative positlons;

Figure 2"is :a like View of th'e same, but showinggthe cha'r turnedtozadifi'erent angle relatively to the desk; 7

Figure 3 is a top plan View of certain of V the chair-mounting parts;

Figure 4 is a like view, but showing said parts in an interrelativelydifl'erent angular 3 position; and v Figure'5 is a side View of aportion of the chair, showing its mountin parts in axial section takenon a vertical p ane corresponding to line 55 of Figure 4:. 153 When aswivelling or revolving chair and a desk usable by the same personoccupy fixed positions. convenient for such use, (as

in the case of school. seats and desks), the turning of the chair onitsswivel mounting is likely to cause its back or arm to strike the deskand thus mar both chair and desk. The present invention obviates'thisdanger by providing improved means for mounting" the chair on its base,whereby the turning movement of thechair is limited.

In the embodiment of the invention as .shown in the drawings, the chair1 (usually positioned fixedly. relatively to the desk 2) comprises abase element designated gener-,

5 ally 3 and a seat element designated generally 4, the seat elementbeing mounted on the base element turnably about a vertical axis. Thisseat element 4 comprises the usual wooden seat 5 with a back 6 and arms7.

A radially-extending horizontally-disposed metallic plate '8.is,ca1'ried in .fixed position (.i, ,e. :nonturnablyi) oniithe base"element, Q

and has a conca-ve.uppersutface: 9.and a circular-groove .110. Aradially-extending horia ely-d seas P at 'i ..-e *i 3b y theseat-element, (being secured. to its -under side as :screwsapassingrthrough orifices 12), this .platehaving an gupwardl-y-;extend?ingprojection or lug 13,;and a: concave .upper surface 1.4 andna icon ixunder zsurfacell5. This p'lat eis also provided .with a circular rib:alfikhea'ring in .the ;grohv,e.10. A third hormentally-disposed ,plate317 hasa c nVex under: surface .18 bearingon; .the. upper surface of theseat, elements Qplat'e L11, and has alsostops 19, 19 .(being theLendsof;agrooye 20-) spaced apart-and adapted toflbe engaged by, the -lug .13 tolimit the turning move ment of theseatelernentl, -15 riction washers.21, -22, pf ifibro usmaterial orthe like, {are interposedr'ghetweenthe.base-elements. plate 8- ..and the .seat .elenienflsfiplate :11, and.between 116. seat .elements said }plate and the uppermost 1019x617respectively. p i 7 This last-mentioned plate 17 's held non-v turnablyon the base element as by itsdownwardly-extending lugs or projections 23seated in the radially-extending grooves 24.

of the baseelements plate 8, such grooves also serving to render thisplate more rigid;

V and this plate 17 is heldon the base element and the mounting partsare held in assembled position, by abolt 25 whose head engages thisplate 17 and, passing'through a central opening in the-seat 'elementsplate 11, is held securely rela tively to the base. element by-the nut26 on the bolts threaded lower end. 7 I y It will be seen that theplates 8, 11 and 17 may be formed from metal sheets vdie= pressed intorequired shape; and that, thus" shaped as shown'in the drawings,"astrong and rigid mounting forthe seat element is provided, particularlyinasmuch as. the plates 8 and 17 fixed on the base element,- slidablybearon the between them.

We claimi 1. In a chair:

fixed plate having a concave upper surface;

a seat element mounted on the base element turnably about a verticalaxis and carrying 10c '7 seat elements plate 11 a base element carryinga radially-extending horizontally-disposed a I radially-extendinghorizontally-disposed fixed slate having an upwardly-extending lug and aconcave upper surface and a convex under surface bearing on the uppersurface of the base elements plate; a horizontally-disposed plate havinga convex under surface bearing on the upper surface of the seat elementsplate, and spaced stops adapted to be engaged by said lug to limit theseat eleinents turning movement, the last-mentioned plate being heldnon-turnably on the base element; I

2. In a chair: a base element carrying a radially-extendinghorizontally-disposed fixed plate having a concave upper surface;

a seat element mounted on the baseelement turnably about a vertical axisand carrying a radially-extending horizontally-disposed fixed platehaving an upwardly-extending lug and a concave upper surface and aconvex under surface bearing on the upper surface of the base elementsplate; a horizonally-disposed plate having a convex under surfacebearing on the upper surface of the seat elements plate,and spaced stopsadapted to be engaged by said lug to limit the seat elements turningmovement, the last-'mentioned'plate'being held non-turnably on the baseelement; friction Washers between the base elements plate and theseatelements plate and the last-mentioned plate.

'3. In a'chair: a base element carrying a radially-extendinghorizontally-disposed fixed plate having a circular groove; a seatelement mounted on the base element turnably about a vertical axis andcarrying a radially-extending horizontally-disposed fixed plate havingan upwardlyextending lug and a circular rib bearing in said groove; ahorizontally -disposed plate bearing on the upper surface of the seatelements plate and having spaced stops adapted to be engaged by said lugto limit the seat elements turning movement, the lastmentioned platebeing held non-turnably on the base element. 7

4. In a chair: a base element carrying a radially-extendinghorizontally-disposed fixed plate having a concave upper surface; a seatelement mounted on the base velement turnably about a vertical axis andfor anchoring the last-mentioned plate nonturnably on' the base element.i In testimony Whereof We have hereunto set our hands at Grand Rapids,Michigan'. this 20th day of February, 1925.

JOHN vAN DEN BOOGAABD. GEORGE HJHAMILTON.

